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The "C" branch runs on a dedicated median on Beacon Street in Brookline, with a total of 18 grade crossings at major cross streets.[2] Like on its sister "B" branch, "C" branch streetcars must stop on traffic signals at street crossings. The signals on Beacon Street in Brookline could in theory be prioritized to make the Green Line run faster. However, the MBTA, which would be expected to pay for the streetcar sensors, does not consider the project to be cost-effective.[3] In 2007, the Boston Globe published letters from riders who are in favor of these sensors,[4] a letter from the MBTA spokesperson arguing that a major study is needed before the MBTA spends money,[5] and a letter arguing that the T's spokesperson is giving too many excuses.[6]

In January 2008, the MBTA hired a consultant to study the issue.[7] As of 2011[update], the Town of Brookline was considering formally asking the MBTA to cooperate in setting up traffic signal prioritization to speed up Green Line trains on Beacon Street.[8]

In Mayor Marty Walsh's "Go Boston 2030" plan, prioritizing traffic signals on Beacon Street was a proposed idea. The plan indicated that the project is planned to be completed within five years.[9]

No stations on the "C" Branch have MBTA parking, although some have a small number of locally controlled parking spots. The only stations with MBTA parking served by "C" streetcars are North Station and Haymarket, which also serve "E" Branch streetcars.[12]

All of the street-level "C" branch stations from St. Marys Street to Englewood Avenue are in Brookline; all the underground subway stops and the Cleveland Circle terminus in the Brighton neighborhood are in Boston.